MIS306 Tree Inspection for Access & Work

MIS306 Tree Inspection for Access & Work

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MIS306 Tree Inspection for Access and Work - 2nd ed. 

Minimum Industry Standard series

Members Price is for Members of The New Zealand Arboricultural Association (NZARB).

The vision of NZ Arb is to represent the arboriculture community and make it the primary organisation for tree care and to maintain relevancy to the Association’s members, so if you are in the NZ tree care industry please consider joining NZARB by clicking the link above if you are not already a member.


This book is one in a series of Minimum Industry Standards produced by Arboriculture Australia Ltd and the New Zealand Arboricultural Association in consultation with the national arboriculture community in both countries. These industry peer-reviewed documents provide a ‘body of knowledge’ which is shared by practitioners and can be used as the basis for training, dissemination of skills and professional development.

This book covers the basics of tree climbing equipment and tree access using a variety of tree climbing skills and techniques. Many other techniques, climbing systems and climbing equipment configurations are possible which are not discussed in this document. Nevertheless, the skills and techniques presented in this document form a solid foundation on which practitioners can build.



Section 1: Conducting site and tree inspections

Introduction to tree inspection
Risk management

  • Risk management terminology
  • Risk management process
  • Risk control measures
  • Safe Work Method Statements and risk controls
  • Recording site inspection
  • Recording tree inspection
  • Work plans

Leading a site and tree inspection
Site inspection and site hazard
Tree inspection

  1. Inspect the site and local environment
  2. Inspect the structural root zone
  3. Inspect the tree trunk, stems and crown

Evaluating hazards

  • Sounding
  • Probing
  • Pull (load) testing

Assessing tree structure and condition

  • Growth habit and structure
  • Branch and stem attachment
  • Co-dominant stems
  • Wood decay
  • Fungi
  • Cracks, splits and other structural defects
  • Cavities and hollows
  • Root damage
  • Tree species and behaviour

Risk control measures for tree access and work


Section 2: Tree hazards

  • Animal damage
  • Branch unions
  • Cracks or splits
  • Deadwood
  • Decay
  • Electrical conductors
  • Epicormic shoots
  • Fire-damaged trees
  • Fungal fruiting bodies
  • Girdling roots
  • Hangers
  • Hollows and cavities
  • Included bark
  • Insect damage
  • Insect swarms or nests
  • Lean
  • Lightning damage
  • Mechanical damage
  • Partial failure
  • Previous failures
  • Root plate lifting
  • Swellings in trunk or in structural timber